fix to post time

@@ -276,7 +276,7 @@ function resources($id, $taxes, $is_fav = false){
 
   $post_date = strtotime(get_post_meta($id, 'searchwp_content_pdf_metadata', true)['CreationDate']);
   if(empty($post_date)) {
-    $post_date = strtotime($post->post_date);
+    $post_date = get_post_time('U',false, $id );
   }
 
   $categories = [];